Add System.dladdr for easier debugging of things that should not go wrong

sjoelund · sjoelund · commit eb68f0c5491f · 2014-10-29T12:08:19.000Z
- dladdr returns the C name of a symbol in the file (typically a function pointer) git-svn-id: https://openmodelica.org/svn/OpenModelica/trunk@23040 f25d12d1-65f4-0310-ae8a-bbce733d8d8e
diff --git a/Compiler/Util/System.mo b/Compiler/Util/System.mo
@@ -1102,5 +1102,30 @@ public function covertTextFileToCLiteral
 external "C" success=SystemImpl__covertTextFileToCLiteral(textFile,outFile);
 end covertTextFileToCLiteral;
 
+public function dladdr<T>
+  input T symbol "Function pointer";
+  output String info;
+  output String file;
+  output String name;
+algorithm
+  (file,name) := _dladdr(symbol);
+  info := file + ": " + name;
+protected
+
+function _dladdr<T>
+  input T symbol "Function pointer";
+  output String file;
+  output String name;
+external "C" SystemImpl__dladdr(symbol, file, name) annotation(Library = {"omcruntime"},Documentation(info="<html>
+<p>Like <a href=\"http://linux.die.net/man/3/dladdr\">dladdr(3)</a>.</p>
+<p>Only works on Linux. Other platforms return dummy strings.</p>.
+</html>"));
+end _dladdr;
+annotation(Documentation(info="<html>
+<p>Like <a href=\"http://linux.die.net/man/3/dladdr\">dladdr(3)</a>.</p>
+<p>Only works on Linux. Other platforms return dummy strings.</p>.
+</html>"));
+end dladdr;
+
 annotation(__OpenModelica_Interface="util");
 end System;
diff --git a/Compiler/runtime/System_omc.c b/Compiler/runtime/System_omc.c
@@ -37,6 +37,10 @@ extern "C"
 {
 #endif
 
+#if defined(__linux__) && !defined(_GNU_SOURCE)
+#define _GNU_SOURCE 1
+#endif
+
 #include <ctype.h> /* for toupper */
 #include <limits.h>
 #include <stdlib.h>
diff --git a/Compiler/runtime/systemimpl.c b/Compiler/runtime/systemimpl.c
@@ -120,9 +120,10 @@ char *realpath(const char *path, char resolved_path[PATH_MAX]);
 #include <sys/unistd.h>
 #include <sys/wait.h> /* only available in Linux, not windows */
 #include <unistd.h>
-#include <dlfcn.h>
 #include <stdlib.h>
 #include <spawn.h>
+
+#include <dlfcn.h>
 extern char **environ;
 
 #define HAVE_SCANDIR
@@ -2671,6 +2672,23 @@ int SystemImpl__covertTextFileToCLiteral(const char *textFile, const char *outFi
   return result;
 }
 
+void SystemImpl__dladdr(void *symbol, const char **file, const char **name)
+{
+#if defined(__MINGW32__) || defined(_MSC_VER)
+  *file = "dladdr failed";
+  *name = "not available on Windows";
+#else
+  Dl_info info;
+  if (0 == dladdr((MMC_FETCH(MMC_OFFSET(MMC_UNTAGPTR(symbol), 1))), &info)) {
+    *file = "dladdr failed";
+    *name = "";
+  } else {
+    *file = GC_strdup(info.dli_fname);
+    *name = GC_strdup(info.dli_sname);
+  }
+#endif
+}
+
 #ifdef __cplusplus
 }
 #endif
